joshuav
Newbie
I just got a 1985 k-5 blazer and when I acell it makes a knock knock noise then once I get up too speed the noise goes away. I just checked the pumpkin and all the rear end gears are fine. What else could it be?
CK5
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I need an answer to a question!!!
- Thread starter joshuav
- Start date
could it be the motor pinging?
I always thought i had a bad ujoint or somethign until a mechanic said the timing was off and the sound was hte motor pinging.
Run your tank almost empty, and put 1/2 a tank of premium in and see if the problem goes away.
If it does, then get your timing adjusted so it won't ping on regular gas.
I always thought i had a bad ujoint or somethign until a mechanic said the timing was off and the sound was hte motor pinging.
Run your tank almost empty, and put 1/2 a tank of premium in and see if the problem goes away.
If it does, then get your timing adjusted so it won't ping on regular gas.
joshuav
Newbie
I have not tryed that. Do you really think all of that metal klunking noise could be from that?
perp
1/2 ton status
cracked flexplate will "knock" under load also. you can see it with a flashlight after pulling trans dust cover, look near the crank flange
just a thought
(BTW auto tranny only)
just a thought
(BTW auto tranny only)
RustBuket
1/2 ton status
Its not an engine knock is it? Thats bad news. If it goes away when you let off tho it probably isn't.
If you have a slight shudder also....you may consider a bad tranny mount..
big jimmy 91
1/2 ton status
Could be the t-case contacting the floor , like it does in my truck due to soft mounts.
I second the flexplate issue.
Experience I had with one was pretty similar. Any time the engine was under load (accelerating from stop, starting at bottom of hill and trying to accelerate even slowly) there would be a quite audible knock.
It's a pretty common problem on all GM vehicles, at least the gen1 SBC.
Experience I had with one was pretty similar. Any time the engine was under load (accelerating from stop, starting at bottom of hill and trying to accelerate even slowly) there would be a quite audible knock.
It's a pretty common problem on all GM vehicles, at least the gen1 SBC.
